Principal Research Engineer, Post-Training

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Redwood City, CA Full-time$275k–$400k / year Posted 30+ days ago

Above market. This role pays above the $250k median for similar USD roles (116 comparable postings in our corpus).

You will lead initiatives spanning data, algorithms, infrastructure, and evaluation, helping define how our models learn from feedback and improve over time. This is a highly cross-functional role that combines deep technical expertise with organizational leadership. You will partner closely with researchers, engineers, product teams, and infrastructure teams to identify the highest-leverage opportunities for improving model performance and user experience. Your work will directly shape the conversational experiences of millions of users every day. At the company, you will have the…

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